What makes is stereo?

freestream · 14th September 2010, 12:02 PM

Hi

Iam currently reading about tube amplifiers and the technology behind it. I have read several manuals and walkthroughs for different kinds of amplifiers but it is one question that i never get answered. It might be a really stupid question but i need a answer for it before i can understand the whole process. What is it that make it a stereo amplifier? first i thought it might be because of the amount of tubes. That in a stereo set both LEFT and RIGHT is treated as mono channels and is amplified separaty. But now i have now seen amplifier with one tube that still have stereo. Can someone explain this for me?

TheGimp · 14th September 2010, 01:40 PM

Stereo by definition is two channels, Left and Right. The left and right channels drive the appropriate left and right speakers.

This allows for spatial intrepretation of the sound.

If bridged it is no longer stereo.

Can you post the schematic of the one tube stereo? or a link to it?

freestream · 14th September 2010, 02:04 PM

Quote:

Originally Posted by TheGimp

Stereo by definition is two channels, Left and Right. The left and right channels drive the appropriate left and right speakers.

This allows for spatial intrepretation of the sound.

If bridged it is no longer stereo.

Can you post the schematic of the one tube stereo? or a link to it?

Right now i do not have any complete schematic, iam still working on it. So, with other words, if i only use ONE tube I can only get mono?

freestream · 14th September 2010, 02:11 PM

This might not be the one I will build in the end but it is still a good example. Will I get sterio via this schematic?

Merlinb · 14th September 2010, 02:20 PM

Quote:

Originally Posted by freestream

Hi
But now i have now seen amplifier with one tube that still have stereo. Can someone explain this for me?

A single glass bottle can contain two individual valves (or even more than two), so stereo is possible.

freestream · 14th September 2010, 02:30 PM

Quote:

Originally Posted by Merlinb

A single glass bottle can contain two individual valves (or even more than two), so stereo is possible.

So a tube like 572B that have 4 pins does only have one valves? so to find a tube with more then one valves i should look for a tube with more than 4 pins?

Soonerorlater · 03:26 PM

If you really must make a stereo amp from one bottle then why not look at this one Vacuum tube audio amplifier : DISCRETE SEMICONDUCTOR CIRCUITS

No apologies, that would only give you a mono amp.

TheGimp · 14th September 2010, 03:24 PM

The 572B is a High Mu triode, directly heated, similar to 811A.

You will need more than that to make an amp. It is suitable as an output tube and might work well in a SET (Single ENded Triode) amp. However, it is a High Voltage tube and I would not recommend making anything with it unless you had a lot of experience.

Danger High Voltage can be lethal!

DF96 · 14th September 2010, 03:40 PM

You could use ELL80 or 6360 (=QQV03-10). But why?

freestream · 14th September 2010, 04:25 PM

Thanks guys now i think i got the hang of it. If i understand it right i should first settle for what tube i want to use and from that choise make a fitting schematic.
Right now i just have a mental image of how i would like to desin the amp. I am a big fan of the big tube, like the size of 572B. I whould like to build a stereo amp (not just a pre amp, it should be strong enough to be standalone and power 2 speakers) with just 2 big tubes. If 572B is a bad choice due to it is High Voltage tube, do any of you know a big tube that is not High Voltage but can still amplify a grate deal?

14th September 2010, 12:02 PM	#1
freestream diyAudio Member Join Date: Sep 2010	What makes is stereo? Hi Iam currently reading about tube amplifiers and the technology behind it. I have read several manuals and walkthroughs for different kinds of amplifiers but it is one question that i never get answered. It might be a really stupid question but i need a answer for it before i can understand the whole process. What is it that make it a stereo amplifier? first i thought it might be because of the amount of tubes. That in a stereo set both LEFT and RIGHT is treated as mono channels and is amplified separaty. But now i have now seen amplifier with one tube that still have stereo. Can someone explain this for me?

14th September 2010, 03:05 PM	#7
Soonerorlater diyAudio Member Join Date: Jul 2008 Location: Belfast	If you really must make a stereo amp from one bottle then why not look at this one Vacuum tube audio amplifier : DISCRETE SEMICONDUCTOR CIRCUITS No apologies, that would only give you a mono amp. Last edited by Soonerorlater; 14th September 2010 at 03:26 PM. Reason: apology

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14th September 2010, 01:40 PM	#2
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	Stereo by definition is two channels, Left and Right. The left and right channels drive the appropriate left and right speakers. This allows for spatial intrepretation of the sound. If bridged it is no longer stereo. Can you post the schematic of the one tube stereo? or a link to it?

14th September 2010, 02:11 PM	#4
freestream diyAudio Member Join Date: Sep 2010	This might not be the one I will build in the end but it is still a good example. Will I get sterio via this schematic?

14th September 2010, 03:24 PM	#8
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	The 572B is a High Mu triode, directly heated, similar to 811A. You will need more than that to make an amp. It is suitable as an output tube and might work well in a SET (Single ENded Triode) amp. However, it is a High Voltage tube and I would not recommend making anything with it unless you had a lot of experience. Danger High Voltage can be lethal!

14th September 2010, 03:40 PM	#9
DF96 diyAudio Member Join Date: May 2007	You could use ELL80 or 6360 (=QQV03-10). But why?

14th September 2010, 04:25 PM	#10
freestream diyAudio Member Join Date: Sep 2010	Thanks guys now i think i got the hang of it. If i understand it right i should first settle for what tube i want to use and from that choise make a fitting schematic. Right now i just have a mental image of how i would like to desin the amp. I am a big fan of the big tube, like the size of 572B. I whould like to build a stereo amp (not just a pre amp, it should be strong enough to be standalone and power 2 speakers) with just 2 big tubes. If 572B is a bad choice due to it is High Voltage tube, do any of you know a big tube that is not High Voltage but can still amplify a grate deal?

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